Tubular ball-mill.



PATENTED APR. 17. 1906.

M. F. ABLE. TUBULAR BALL MILL.

APPLIOATION FILED MAR. 23, 1905.

v MOI 818,211.

3 SHEETS-SHEET 1.

PATENTED APR. 1'7, 1906.

No."818,2l1.

3 SHEETS-SHEET 2 Fig. 5.

No: 818,211- PATENTED APR. 17, 1906.

M. F. ABBE'I.

TUBULAR BALL MILL.

APPLICATION FILED MAE.23, 1905.

3 SHEETS-SHEET s.

UNITED STATES MAX r. Assn, or NEW YORK, N. Y.

ra'rnn'r orrron.

TUEULAR BALL-Mitch Specification of Letters Patent.

Patented April 17, 1906.

Applicationfiled lliarcli 23,1905. Serial No. 251,601.

To aZZ whom it may concern;

Be it known that I, MAX F. Anna, a citizen of the United States, residing at New York city, Manhattan, county and State of New York, have invented new and useful Improvements in Tubular BalLMills, of which the following is a specification.

This invention relates to an improved tubular ball-mill, and more particularly to means for supporting and simultaneously ingress-head of the mill; Fig. 4, a cross-sec- I tion on line 4 4, Fig. 3; Fig.6, a longitudinal section through. the egresdhead; Fig. 6, a cross-section on line 6 6, Fig. 5, showing an imperforate gate; Fig. 7, a detail of a slotted. gate; Fig. 8, a longitudinal section of a modification of the egress-head on line 8 S, Fig. 9 Fig. 9, a cross-section on line 9 9, Fig. 8; F ig. 10, an inner view of part of the ingress-head, showing the ingress-gate; Fig. 1.1, a section on-line 11 11, Fig. 10; Fig. 12, a detail of part of the ingress-head, showing the segmental slide; Fig. 13, a top view thereof, and Fig,.14 a cross-section on line 14 14, Fig. 12.

The letter A- represents the rotatable drum or cylinder of the mill, containing thepebbles a, as usual. ,The cylinder A is suspended from a driving-shaft b, which is supported in. bearings b and carries the driving-pulley W. The means for suspending the cylinder A from shaft 6 consist of endless ropes orchains c, passing over alined pulleys a b of the parts A and b, respectively. By the construction described the shaft assumes the dual function of supporting the cylinder A and of rotating it.

If the shaft 1) is rotated to move the ropes in the direction of the arrows at, the cylinder is slightly deflected sidewise, as shown in Fig. 2. k The upward runs of the ropes having a tendency to lift the cylinder will effect a slacking of the downward runs along their lines of engagement with the cylinder, as at c. In this way a tendency is imparted to the cylinder to roll toward the slack'i. (2., in

the direction of the rotation imparted to it by the ropesso that the power necessary for operating the mill is considerably reduced. Means are provided for sustaining the cylinder while at rest in its deflected position, and

. thus maintain the proper engagement between the cylinder and the stationary parts of the mill hereinafter described. These means are shown to consist of a sustainingshaft (1, turning in bearings d and'placed at that side of the cylinder A toward which it is deflected. The cylinder is held to the shaft (Z by endless ropes c, passing over pulleys a d of the parts A and (1, respectively. The ropes e are of such a length that they will slack slightly when the mill is operated at normal speed, but will prevent the cylinder from assuming a position vertically below shaft 6 when the mill is at rest. It is obvious that different means for maintaining the cylinder in its deflected position may be employed.

The ingresshead of the cylinder A is di vided by an outer wall f, having manholej', an inner wall f an intermediate partition f into an outer chamber and an inner chamberf. The outer wall f has a central perforation to accommodate the discharge end of a fixed hopper 9 supported upon a base g and serving to feed the material to be ground into outer chamber f From this chamber the material enters the inner chamher] through a segmental opening f 5 of partition f made near the periphery of the same. This opening is controlled by a segmental slide 9, guided along curved railsf of partition f. This slide terminates at one end in an inclined deflector 9, that serves to direct the material toward opening f In order to control the size of such opening, the slide 9 may be locked in different positions by a cross-bar g engaging a grooved seat g of the slide and one pair of opposing notches f 7 r of rails f A pin or catch g secures the cross-bar 9' in place after having been seated. VVIthin the inner chamberf is contained a spiral ingress-conveyer h, which by the rota.

opening f into the working chamber ajof drum The opening f is controlled by a gate i, having perforations 'i oi a size to permit the free passage oithe material to beground, but to prevent the escape of pebbles a' from the drum. The openingsi are made, preferably,

in the form of circumferential recesses and concentric inner slots, Fig. 10, whereby a iree discharge of the material. is insured.

The gate 4'. is provided with a screw-spindie 11, engaging a tapped opening of partition f The spindle if passes through hopper g and is supported in the standard g. During the normal operation of the parts the gate i is closed against its seat in wallf, Fig. 11, so that the material to be ground must pass through the openings 'i into chamber a. At the same time the pebbles (i, even if covering the gate i, are prevented from entering chamberf If it is desired from time to time to charge the drum with a fresh sup ply of pebbles, the old charge is removed throu h the egress head in manner hereinafter described, and then the gateiis opened, Fig. 3, so that the pebbles filled into hopper g will be carried .by the conveyor it, through opening f into working chamber a The egress end of drum A may be either provided witha head, as shown in Figs. 5 and 6, which is used for wet grinding, or witha; head, as shown in Figs. 8 and 9, which is used N 1th the construction for dry grinding. shown in Fi s. 5 and 6 the head consists of an outer wallj (having manhole 7' and of an inner wall. j, that form. an intervening chamber Into acentral opening of the inner wall y" is fitted a discharge tube or nipple k, that may be provided with a cook The inlet of tube Jt is provided with a perfora-tcd'end plate k which permits the free discharge of the suspended ground contents of cylinder A, but prevents the escape of the pebbles. The cock 7c should be so set that a uniform liquid-level is maintained, the volume of discharged pulp corresponding sub-F stantially to the volume of water introduced into drum A, together with the material to be ground. In lieu of providing the dischargepipe 7c with a cock Ir a set of interchan cable dischargeuiozzles, having bores of di erent diameters, may be used.

The inner wall 7" is provided near its periphery with an opening that may be closed either by an imperiorate gate Z, Fig. 6, or by a slotted gate m, Fig. 7. he chamber j contains a spiral egrcss-convr-ya-r n, the inner Outwardly-ilaring convolu to n of which surrounds tube k. This inner convolutc n expebbles areto be discharged.

that the cylindrical portion of the conveyer' merges into an outwardly-flaring dischargeconvolute. If it is desired irointinie to time to empty the drum A, the gate Z is replaced by gate m, so that the unground sediments will be discharged through the latter into chamber j while the pebbles a are held back. The conveyor n will li t the sediments toward the center of chamber 7' from which they are emptied" by the convolute a, the tapering shape oi which prevents the settling of the sediments upon the conveyor. After the sediments have thus been discharged the gate m is removed, so that the pebbles will fall into chamber 7' and be discharged by the con vcycr a in manner above described with re lation to thesediments.

in Figs. 8 and 9 the egress-head of drum is composed of an outer wall 0 and an inner wall 0, that form an intervening chamber 0. This chamber contains a spiral egress-conveyer'p, having a central outwardly-flaring convolute p. The inner wall 0 is provided, beyond the outer convolute of conveyor 10, with a series of radial slits 0? for the discharge of the ground producti'rom chamber a" into.

chamber 0 Within chamber 0 the ground material is lifted by the conveyor p toward the center of the chamber to be finally discharged through the flaring inner. convolute 'p. A manhole in walla, which is normally closed by a cover 0, is opened whenever the This manhole is formed near the periphery of wall 0 to convey the pebbles to the chamber 0 from which they are discharged in manner hereinabove described with relation to the ground material.

What I claim is- 1. A tubular ball-mill composed of a rotatable cylinder, inclosed pebbles, a powershaft, means for suspending the cylinder from said shaft, and means for rotatably sustaining the cylinder in a deflected position, substantially as specified.

. 2. A tubular ball-mill composed of a rotatable cylinder, inclosed pebbles, a powershaft, means for suspending the cylinder from said shaft, a sustaining shaft journaled side'wisefrom the cylinder, and means for rotatably connecting the cylinder to the sustaming-shaft, substantially as specified.

3. A tubular ball-mill provided with a spiral ingress-conveyor having an inwardly-liaring central convolute, which merges into the body of the conveyer and is deflected at an obtuse angle from the same, substantially as specified.

4. A tubular ball mill provided with a working chamber, an ingress-head having 2 central centrally-perforated inner wall that establishes communication between the working chamber and head, a spiral conveyer withm the headthe innermost convolutev of which surrounds the central opening of the inner wall, a perforated gate controlling said opening, and means for opening and closing said gate, substantially as specified.

5. A tubular ball-mill provided withv a working chamber, an ingress-head having a y-perforated inner wall that establishes communication between the working chamber and head, a spiral conve er within the head and having an inwardlyaring central eonvolute that surrounds the central opening of the inner wall, a perforated gate controllin said opening, and means for open-. ing and c osing said gate, substantially as 6. In a tubular ball-mill, an ingress-head provided with an outer chamber, an inner. chamber,' an intermediate partition having an opening, and a'slide having a deflector and adapted to control said opening, substantially as specified. I

7 in a tubular ball-mill, an ingress-head provided Wit/111311 outer chamber, an inner discharge-opening, a parchamber having a titi on intermediate the chambers and having a slide-controlled opening, a spiral conveyer Within the inner chamber and having an m,- wardly-fiaring centralconvolute, and a perforated gate that controls the dischargeopening of the inner. chamber, substantia ly as specified. y

8. In a tubular ball-mill, an e ass-head having an outer Wall, an inner wa l, and an intervening spiral egress-conveyer having an outwardly-flaring central convolute inter.- mediate the walls, substantially as specified. 9.111 a tubular ball-mill, an egress-head provided with an inner wall, an outer Wall, an intermediate chamber, a spiral conveyer Within the chamber, a cock-controlled discharge-tube surrounded by the inner convo lute of said conve er, and a perforated ]plate at the inner end 0 said tube, substantia y as specified.

Signed by me at tan,) New York,.this 22d day of March, 1905.

' MAX F. ABBE:

Witnesses:

WILLIAM SoHULz, FRANK v; BBIESEN.

New York city, (Manhat-' 

